watchOS 3.1.3 (build 14S6960) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2017-01-23T18:02:07Z. The update package is 50.6 MB. This is a delta (partial) update that requires 3.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5e3954471fd413286fd0441671aac040484e164f.zip.